That schematic is basically the same as what I do. You can add a 230v transformer instead of using the neutral and one phase. Most machines I have worked on have those, but I have done it the way you are showing.
The other question is the grounding of the screens of the analog, encoder, and step/dir signals. These should be connected to earth at one end and the other left unconnected. Not sure if it really makes a difference which end.... Henk On Sun, 29 Dec 2019, 14:37 , <emc-users-requ...@lists.sourceforge.net> wrote: > Send Emc-users mailing list submissions to > emc-users@lists.sourceforge.net > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.sourceforge.net/lists/listinfo/emc-users > or, via email, send a message with subject or body 'help' to > emc-users-requ...@lists.sourceforge.net > > You can reach the person managing the list at > emc-users-ow...@lists.sourceforge.net > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Emc-users digest..." > > > Today's Topics: > > 1. Re: looking for advice on best wiring practices and grounding > on cnc mills (andrew beck) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 29 Dec 2019 23:37:36 +1300 > From: andrew beck <andrewbeck0...@gmail.com> > To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] looking for advice on best wiring practices > and grounding on cnc mills > Message-ID: > <CALQw8iM=2HNVzhS7FVDbe0y= > c+-_a8ce_sasvjzasqbzcot...@mail.gmail.com> > Content-Type: text/plain; charset="UTF-8" > > Hey everyone > > So just getting to the bottom of these emails and thanks so much for all > the replies. > > There is much food for thought. > > If you missed it up in the emails here is the current plan for wiring the > control panel. > > yuhai servo drive manual > < > https://drive.google.com/file/d/17inZoRboGQP3lqn0KHd343NlmDQ1CxzS/view?usp=sharing > > > Linuxcnc mill control panel drawing > < > https://drive.google.com/file/d/1rJYzUGXLrSKuDARQ878wc5RlkjgPqSCr/view?usp=sharing > > > > All the three phase stuff is pretty standard I think. The main problem I > have is that I am not sure how the grounding should work. Eg do I tie the > 24 volt powersupplies to ground on the input or output etc and any safety > stuff I need to make sure I do. > > The only opti isolation I have is in the mesa 7i76 card. > > So any thoughts feel free to let me know. I am planning on powering this > up tomorrow. > > Regards > > Andrew > > On Fri, Dec 27, 2019 at 8:03 AM Chris Albertson <albertson.ch...@gmail.com > > > wrote: > > > A ground loop is then a single device is connected to ground more than > > once. A good example is a motor driver. It might in a "power" > > input called "+" and "-" with the minus side grounded to the AC mains > > ground or a chassis frame ground. The in addition there is a > > logic level control signal that is "signal" and "ground" wires. > > This is a classic gound loop. > > > > How to break it? Use optical isolation on the signal. This places an > > air-gap in the control signal. > > > > Most of the time the system is not so simple as the above but the > > concept is the same, multiple ground connections are not good. Why? > > Because in theory current can flow if you have a loop but can never > > flow if there is not a closed loop. Then Ohm's law applies -- if > > there is current flow there is voltage drop. If the voltage drops > > across a gound then you have tow "grounds" that are not the same > > voltage. This can be really serious if the motors are large. > > > > There are a number of conventions that work. but they all do the same > > thing, they reduce the number of ground connects to one per "part" of > > the system. > > > > All the rules try to do the same thing, connect nuetral to ground ONLY > > at the building service entrance, use opto's on all signal lines. > > It is all the same idea > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > ------------------------------ > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------ > > End of Emc-users Digest, Vol 164, Issue 89 > ****************************************** > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
